包内有几十个51单片机的小程序，方便开发者写程序是不用总是从头来过，可以直接修改使用。（ad转换，iic,pwm,led显示，步进电机控制等等）-Package has dozens of small procedures, 51 single-chip microcomputer for developers to write programs is not always the beginning, can be used directly to modify